Grate for stoker furnaces



1. s. S'KELLY.

GHATE FOR STOKER FURNACES.

APPLICATION FILED NOV. I9, 1919.

1,438,190. Patented Dec. 12, 1922.

'LII'.Ll E E.. 9 I 9 Patented Dec. 12, 1922..

JOI-IN S. SKELLY, OF MONONGAHELA, PENNSYLVANIA; ASSIGNOR TO COMBUSTION ENGINEERING CORPORATION, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

GRATE FOR STOKER FURNACES.

Application. filed November 19, 1919. Serial No. 339,121.

To all whom t may concern.'

Be it known that I, JOHN S. SKELLY, a citizen of the United States, residin at Monongahela, county of lvashington, tate of Pennsylvania, have invented acertain new and useful Improvement in Grates for Stoker Furnaces, of which the following is a full, clear, and exact description.

My invention relates to improvements in grates for stoker furnaces and has for its object to provide a new and improved grate which will permit the upward passage of air to superimposed fuel, and at the same time prevent or retard the downward sifting of ashes and fine coal. One feature of my invention consists in providing alternating bars of a grate having a plurality of tubular grate bars of the general type shown in patent to lVood, No. 818,010, dated April 17, 1906, with laterally projecting flanges which overlap the upper surfaces of the intermediate bars and are spaced away therefrom so as to permit the passage of air from beneath the grate to the fuel. Another feature of my invention consists in making these flanges hollow. My invention is adapted for use in stoker furnaces of various kinds, including the type of said Patent No. 818,010 andl other types.

The following is a description of an embodiment of my invention, reference being had to the accompanying drawings, in which- Fig. 1 is a perspective view of a portion of a grate which by reason of the construction of its bars embodies my invention;

Fig. 2 is a perspective view of a section of the same on the line 22, Fig` 1.

Referring more particularly to the drawings l and 2 are tubular grate bars arranged adjacent to one another, the bars 1 being movable and the bars 2 stationary. The bars are supported at their upper ends by a retort Wall 3 and at their lower ends by the wall 4 of an air chamber 5, the movable bars being provided with recesses in which the flange on a rocker bar 6 fits so that as the rocker bar is oscillated by any suitable means the movable'` bars are moved longitudinally. The rocker bar is supported by a wall 7, which with the wall 3 incloses an air duct 8. The sides of the bars 1 and 2 are spaced apart a suflicient distance to permit the free passage of air between them and the bars 1 are provided with lateral flanges 9, which extend over the tops of the bars 2, but are spaced away therefrom so as to furnish a free space at that point for the air passing between the adjacent bars. The bars 1 and 2 are supported so that the flanges 9 do not come in contact with the bars 2 but are held spaced away therefrom.

The flanges 9, 9 are hollow having recesses 92 therein. They therefore have a more extended internal surface which is subject to the cooling effect of air passing through the bars', with theresult that not only are the flanges kept cooler but the air is exposed to a greater surface and hence more highly heated. In the embodiment shown air is forced into the duct 8, from whence it passes through the port 10, through the tubular Ipassages 11, from which it is discharged through the ports 12 to the air chamber 5, from whence it passes upward between the bars of the grate and through the openings between the flanges 9 and the upper surface of the bars 2 to the fuel superimposed upon the grate. The flanges 9 tend to prevent the downward sifting of ashes and fine coal between the adjacent bars 1 and 2, and the upward current of air passing in the direction shown by the arrows in Fig. 2 tends to keep these passages open and to carry toward the bed of the fire any ashes or fine coal which might otherwise tend to sift down between the bars. `IVith this construction the bars preferably move approximately parallel to their longitudinal axes so that the distance between the flanges 9 and the upper surface of the 'bars 2 remains substantially constant.

As will be evident to those skilled in the art, my invention permits of various modifications without departing from the spirit thereof or the scope of the appended claims. l

What I claim is:

1. In a grate for a stoker furnace, composed of a plurality of bars of two types, one movable and the other stationary, alterhating with one another, and having passages adjacent to the sides of said bars for the passage of air and means for reciproeating the movable bars, combined with an air duct and an air chamber both beneath said bars, the improvement which consists in having on theupper portions of bars of one type hollow flanges overlapping the tops of the adjacent bars, said hollow flanges being spaced away from' the tops of saidadjacent bars so as to provide continuations of said passages, all of said bars being tubular and provided with inlet ports arranged to receive air from said-air duct and outlet ports ar` ranged to deliver air to said chamber for causing the air passing through said tubular bars-to pass upward through said passages to the superimposed fuel. l

ternating with one another, the bars .of one type being hollow and having hollow flanges overlapping portions of the bars of the 15 other type and spaced away therefrom.

JoHN s. sKnLLr. 

